DIP-13: add application session authentication and application encryption sub-features - #191
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…ncryption sub-features Registers identity sub-features 6' (per-login session authentication keys) and 7' (per-contract application encryption keys), both with DIP-14 256-bit hardened leaves keyed by the identity id and by a request id or bound data contract id, so that wallets derive them without wallet-local indices. Updates the DIP-9 feature 5' assignment row. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughDIP-0013 defines Application Session Authentication and Application Encryption key paths. DIP-0009 registers both paths under Identity Keys. ChangesApplication key paths
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Merge Risk: ⚪ Minimal · up to The application key paths are consistently specified and registered, with no actionable merge-blocking risk identified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@dip-0013.md`:
- Around line 225-228: Update the request id derivation description to require
canonical byte serialization of the ephemeral request public key for each
supported key type before applying double-SHA256. Specify that the 32-byte
digest is interpreted as a big-endian 256-bit unsigned integer using DIP-0014
ser256, then used as the hardened child index.
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dip-0009/assignments.mddip-0013.md
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… order Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This was referenced Sep 19, 2026
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…feature paths Adds connect_key_derivation_path / derive_connect_keypair_from_master, building m/9'/coin'/5'/<subFeature>'/0'/<identityId>'/<leaf>'[/<purpose>'] with DIP-14 256-bit hardened children for the identity id and the leaf, so nothing wallet-local (identity ordinal, key counter) is an input and two devices restored from one seed derive the same key. Sub-feature 6' is the session authentication key (leaf = request id); 7' is the app encryption pair (leaf = bound contract id, purpose' = 1 ENCRYPTION or 2 DECRYPTION). Registered by the DIP-13 amendment dashpay/dips#191. The FFI entry dash_sdk_derive_connect_key_with_resolver follows dash_sdk_derive_identity_key_at_slot_with_resolver: the mnemonic is pulled through the client-owned resolver into a zeroized buffer for the call only, and the returned ConnectDerivedKeyFFI is plain data the paired _free zeroizes. Purpose values other than 0, 1 and 2 are refused. Fixed vectors (all-zero-entropy mnemonic, identity 0x35*32, leaf 0x6B*32) are pinned for both networks. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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…feature paths Adds connect_key_derivation_path / derive_connect_keypair_from_master, building m/9'/coin'/5'/<subFeature>'/0'/<identityId>'/<leaf>'[/<purpose>'] with DIP-14 256-bit hardened children for the identity id and the leaf, so nothing wallet-local (identity ordinal, key counter) is an input and two devices restored from one seed derive the same key. Sub-feature 6' is the session authentication key (leaf = request id); 7' is the app encryption pair (leaf = bound contract id, purpose' = 1 ENCRYPTION or 2 DECRYPTION). Registered by the DIP-13 amendment dashpay/dips#191. The FFI entry dash_sdk_derive_connect_key_with_resolver follows dash_sdk_derive_identity_key_at_slot_with_resolver: the mnemonic is pulled through the client-owned resolver into a zeroized buffer for the call only, and the returned ConnectDerivedKeyFFI is plain data the paired _free zeroizes. Purpose values other than 0, 1 and 2 are refused. Fixed vectors (all-zero-entropy mnemonic, identity 0x35*32, leaf 0x6B*32) are pinned for both networks. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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…ption paths Adds sub-features 6' (application session authentication) and 7' (application encryption) under m/9'/coin_type'/5'/ from the DIP-13 amendment in dashpay/dips#191: the sub-feature constants and mainnet / testnet roots in dip9.rs, two DerivationPathReference variants (declared after Root because the bincode derive encodes variants by position), and DerivationPath::application_session_authentication_path / application_encryption_path in bip32.rs, with ApplicationKeyPurpose next to KeyDerivationType for the trailing key purpose level. The identity, request and contract ids are DIP-14 256-bit hardened children. Tests pin the path strings on both networks and the derived public keys for the all-zero-entropy mnemonic, with the uniform ids dashpay/platform already pins (so moving the derivation here moves no key) and with non-uniform ids so a byte-order or argument-order change fails. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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…ption paths Adds sub-features 6' (application session authentication) and 7' (application encryption) under m/9'/coin_type'/5'/ from the DIP-13 amendment in dashpay/dips#191: the sub-feature constants and mainnet / testnet roots in dip9.rs, two DerivationPathReference variants (declared after Root because the bincode derive encodes variants by position), and DerivationPath::application_session_authentication_path / application_encryption_path in bip32.rs, with ApplicationKeyPurpose next to KeyDerivationType for the trailing key purpose level. The identity, request and contract ids are DIP-14 256-bit hardened children, which only secp256k1 derivation defines, so the builders take no key type and always put ECDSA (0') at the key type level. A BLS key cannot be requested on these paths. Tests pin the path strings on both networks and the derived public keys for the all-zero-entropy mnemonic, with the uniform ids dashpay/platform already pins (so moving the derivation here moves no key) and with non-uniform ids so a byte-order or argument-order change fails. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The identity, request and contract id levels are DIP-14 256-bit children, which DIP14 defines only for secp256k1 derivation, and the encryption pair is used for secp256k1 ECDH. Key type 1' (BLS) is therefore reserved on sub-features 6' and 7' rather than offered: a BLS deriver has no defined way to derive the 256-bit levels. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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…ption paths (#1049) Adds sub-features 6' (application session authentication) and 7' (application encryption) under m/9'/coin_type'/5'/ from the DIP-13 amendment in dashpay/dips#191: the sub-feature constants and mainnet / testnet roots in dip9.rs, two DerivationPathReference variants (declared after Root because the bincode derive encodes variants by position), and DerivationPath::application_session_authentication_path / application_encryption_path in bip32.rs, with ApplicationKeyPurpose next to KeyDerivationType for the trailing key purpose level. The identity, request and contract ids are DIP-14 256-bit hardened children, which only secp256k1 derivation defines, so the builders take no key type and always put ECDSA (0') at the key type level. A BLS key cannot be requested on these paths. Tests pin the path strings on both networks and the derived public keys for the all-zero-entropy mnemonic, with the uniform ids dashpay/platform already pins (so moving the derivation here moves no key) and with non-uniform ids so a byte-order or argument-order change fails. Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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…feature paths Adds connect_key_derivation_path / derive_connect_keypair_from_master, building m/9'/coin'/5'/<subFeature>'/0'/<identityId>'/<leaf>'[/<purpose>'] with DIP-14 256-bit hardened children for the identity id and the leaf, so nothing wallet-local (identity ordinal, key counter) is an input and two devices restored from one seed derive the same key. Sub-feature 6' is the session authentication key (leaf = request id); 7' is the app encryption pair (leaf = bound contract id, purpose' = 1 ENCRYPTION or 2 DECRYPTION). Registered by the DIP-13 amendment dashpay/dips#191. The FFI entry dash_sdk_derive_connect_key_with_resolver follows dash_sdk_derive_identity_key_at_slot_with_resolver: the mnemonic is pulled through the client-owned resolver into a zeroized buffer for the call only, and the returned ConnectDerivedKeyFFI is plain data the paired _free zeroizes. Purpose values other than 0, 1 and 2 are refused. Fixed vectors (all-zero-entropy mnemonic, identity 0x35*32, leaf 0x6B*32) are pinned for both networks. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Motivation
Wallets are starting to register scoped, expiring keys on an identity on behalf of external applications (a dApp asks the wallet for access; the wallet registers a key with bounds and an expiry rather than handing over one of the identity's own keys). Those keys need to be derived from the seed without any wallet-local counter, so that any wallet restored from the same mnemonic derives exactly the same keys, on any device, in any order. The encryption keys additionally need to be keyed by the data contract they are bound to, so the key belongs to the data it protects rather than to the application that asked for it: a second application the user authorizes for the same contract derives the same pair and can read the same documents.
This PR registers two new sub-features under the DIP-13 identity feature (
5') and updates the DIP-9 assignment row for it. Existing sub-features0'–5'are untouched.Paths
sub feature'6'session authentication,7'application encryptionkey type'0'ECDSA secp256k1,1'BLSidentity id'request id'contract id'key purpose'1'ENCRYPTION,2'DECRYPTION, the identity key purpose the derived key is registered with, so an identity holds a DashPay-style pair per contractWhy DIP-14 leaves instead of DIP-13 key indices
The
key index'under sub-feature0'is a wallet-local counter. Two devices restored from one seed would race for the next index, and recovery would have to scan past every dead session key to find the live ones. With the identity id and the request id or contract id as 256-bit hardened leaves, nothing wallet-local is an input: session keys are ephemeral and are never rediscovered (their public halves and lifetime live on the identity), and an encryption key is found on the identity by its contract bounds and then re-derived from that contract's id.First consumer
The first consumer is the DashPay Connect wallet-to-dApp login protocol, used by Yappr with dashwallet-ios and dash-wallet (Android).
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Summary by CodeRabbit
6'identity sub-path, including request-specific hardened derivation for short-lived authentication.7'identity sub-path, including contract-specific encryption and decryption keys.ENCRYPTION(1') andDECRYPTION(2') key purposes, and clarified that both paths use ECDSA keys while BLS is reserved.